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BEQ: Difference between revisions

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'''BEQ''' (Branch if Equal) is a 65x instruction that performs a jump if the [[zero flag]] is set.
'''BEQ''' (Branch if Equal) is a 65x instruction that performs a jump if the [[zero flag]] is set.  If the zero flag is clear, control simply falls through to the instruction following BEQ.


No flags are affected.
No flags are affected.
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===== Cycle Penalties =====
==== Cycle Penalties ====
* BEQ takes an extra cycle if the branch is taken
* BEQ takes an extra cycle if the branch is taken
* BEQ takes another extra cycle if the branch taken crosses a [[page]] boundary in [[emulation mode]]
* BEQ takes another extra cycle if the branch taken crosses a [[page]] boundary in [[emulation mode]]

Latest revision as of 17:53, 23 August 2024

Basic Info
Addressing Mode Opcode Length Speed
Program Counter Relative F0 2 bytes 2 cycles*
Flags Affected
N V M X D I Z C
. . . . . . . .

BEQ (Branch if Equal) is a 65x instruction that performs a jump if the zero flag is set. If the zero flag is clear, control simply falls through to the instruction following BEQ.

No flags are affected.

Syntax

BEQ nearlabel

Cycle Penalties

  • BEQ takes an extra cycle if the branch is taken
  • BEQ takes another extra cycle if the branch taken crosses a page boundary in emulation mode

See Also

External Links